My comments:
Under the belt is originally another way of saying in the stomach, descriptive of the image of swallowed food ending up in one’s belly.
Imagine the satisfied look of someone who’s been starving for some time having a full meal. How he’d have to loosen up his belt a bit to feel even more comfortable with himself.
Hence, as a metaphor, having something under one’s belt means one has gained or achieved something good.
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Take something with a pinch of salt
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About the author:
Zhang Xin(张欣) has been with China Daily since 1988, when he graduated from Beijing Foreign Studies University. Write him at: zhangxin@chinadaily.com.cn, or raise a question for potential use in a future column.